feat: Add analytics tracking to VShare WebView (#161)

* feat: add analytics tracking to VShare WebView

Add custom User-Agent and source parameter to track V2er app traffic
to VShare page for analytics purposes.

Changes:
- Set custom User-Agent: "Mozilla/5.0... V2er-Android/{version}"
- Add source parameter to URL: "?theme={theme}&source=v2er-android"
- Add getAppVersion() method to retrieve app version for User-Agent

This enables VShare page to:
1. Identify traffic from V2er Android app via User-Agent header
2. Track app version distribution
3. Filter analytics by source parameter

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* refactor: address Copilot review feedback for VShare analytics

Address code review feedback from Copilot:

1. Use Uri.Builder for safer URL construction
   - Replace manual string concatenation with Uri.Builder
   - Properly encode query parameters
   - Handle existing parameters correctly

2. Replace PackageManager with BuildConfig.VERSION_NAME
   - Use BuildConfig.VERSION_NAME directly (no try/catch needed)
   - Avoid deprecated PackageManager.getPackageInfo() call
   - Simpler and more reliable implementation

Changes:
- VshareWebActivity.java:106-114: Use Uri.Builder for URL construction
- VshareWebActivity.java:286-288: Simplify getAppVersion() with BuildConfig
- Add BuildConfig import

Note: Test coverage suggestions noted but deferred for future enhancement.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: graycreate

app/src/main/java/me/ghui/v2er/module/vshare/VshareWebActivity.java

@@ -22,6 +22,7 @@
 import androidx.annotation.Nullable;
 
 import butterknife.BindView;
+import me.ghui.v2er.BuildConfig;
 import me.ghui.v2er.R;
 import me.ghui.v2er.module.base.BaseActivity;
 import me.ghui.v2er.module.base.BaseContract;
@@ -103,13 +104,14 @@ protected void init() {
 
         setupWebView();
 
-        // Compute URL with theme parameter based on current app theme
-        String url = VSHARE_BASE_URL;
-        if (DarkModelUtils.isDarkMode()) {
-            url += "?theme=dark";
-        } else {
-            url += "?theme=light";
-        }
+        // Compute URL with theme and source parameters for analytics tracking
+        String themeParam = DarkModelUtils.isDarkMode() ? "dark" : "light";
+        String url = Uri.parse(VSHARE_BASE_URL)
+                .buildUpon()
+                .appendQueryParameter("theme", themeParam)
+                .appendQueryParameter("source", "v2er-android")
+                .build()
+                .toString();
         mWebView.loadUrl(url);
     }
 
@@ -143,6 +145,12 @@ private void setupWebView() {
 
         WebSettings settings = mWebView.getSettings();
 
+        // Set custom User-Agent for analytics tracking
+        String defaultUserAgent = settings.getUserAgentString();
+        String appVersion = getAppVersion();
+        String customUserAgent = defaultUserAgent + " V2er-Android/" + appVersion;
+        settings.setUserAgentString(customUserAgent);
+
         // Enable JavaScript
         settings.setJavaScriptEnabled(true);
 
@@ -273,6 +281,13 @@ private int getStatusBarHeight() {
         return result;
     }
 
+    /**
+     * Get app version name for User-Agent tracking
+     */
+    private String getAppVersion() {
+        return BuildConfig.VERSION_NAME != null ? BuildConfig.VERSION_NAME : "unknown";
+    }
+
     /**
      * Handle URL loading for WebView
      * Returns true if the URL was handled externally, false if WebView should load it